weg-mann



(No Model.) 7 Sheets-Sheet 1.

F. WEGMANN ROLLER MILL.

No. 276,104. Patented Apr.'17,1883.

v I VVITNESSESI |N N. pnzns Pholu-Lilhagrapher, Washingion. n. c.

ENTER- (No Model.) Q 7 Sheets-Sheet; 2.

F. WBGMANN.

- ROLLER MILL. No. 276,104. Patented Apr. 17,1883.

WITNEEEEEAI NVEiN-TEJR:

N PETERS. Fhom-Limo n her. Washin ton, D. c.

(No Model.) 7 Sheets-Sheet 3.

F. .WEGMANN.

ROLLER MILL.

No. 276,104. Patented'Apr. 17,1883.

WITNE'EEEEIZ 7 [NVEN'T'IIIRI 1" gM/M' Mei v 2% N. PETERS, Pholo-Ulhogmphen Washingwn. D. C.

(No Model.) 7 Sheets-Sheet 4.

P. WEGMANN.

ROLLER MILL.

Patented Apr. 17,1883.

INVE NTUR WITNEEEES (No Model.) I 7 Sheets-Sheet 5.

P. WEGMANN.

ROLLER MILL. No. 276,104. Patented Apr. 17,1883.

WITWESSES IJVVEJVTOR frame/C55 W4, g 72 I I I .zlitorney:

N. PETERS. PhowLRhognpher, Wash] nnnnnnn C.

(No Model.) Sheets-Sheet 6.

' P. WEG-M'ANN.

ROLLER MILL.

Patented Apr. 17,1883.

.ttorneys.

N. PETERS. Fhnlo-Lilhngnpher. Walhmglon. DYC.

(No Model.) I 7 Sheets-Sheet 7. P. WEGMANN. ROLLER MILL.

Nb; 276,104. Patented Apr. 17,1888.

UNITED STATES PATEMJ p FRIEDRICH IVEGMANN, OF ZURICH, SYVITZEItLAND.

ROLLER-MILL.

SPECIFICATION forming part of Letters Patent No. 276,104, dated April 17, 1883,

Application filed February 10, 1883. (No model.) Patented in England January 15, 1879, No. 180, and June 23, 1879, No. 2,5!3;

in Germany June 19, 1879, No. 9,926, and in Austria September 23, 1879, No. 2982.

To all whom it may concern:

Be it known that I, FRIEDRICH WEGMANN, of Zurich, in the canton of Zurich, Republic of Switzerland, have invented certain new and useful Improvements in Roller-Mills, of which the following is a specification.

My invention relates to roller-mills for reducing grain and other substances; and the improvements consist in various features and details hereinafter more fully explained, but having reference more particularly to the manner of mounting, adjusting, and driving the rolls, and to an arrangement of the roller-adjustingdeviccs and the feed-controlling mechanism, whereby the feed is stopped simultaneously with the separation of the rolls, whether said rolls continue to rotate or not.

In the accompanying drawings, Figure 1 represents a side elevation of my improved mill, partially in section; Fig.2, an end elevation, likewise partially in section; Fig. 3, a view illustrating the manner of mounting the adjustable roll; Fig. 4, a sectional view taken on the line .t' .r of Fig. 3; Fig. 5, a side elevation of the machine, showing its external appearance; Fig. 6, an end view of the same, partly sectioned to illustrate the construction and arrangement of the driving-pulley and its clutch; Figs. 7 and 8, side elevations of the machine, looking from opposite sides, showing the arrangement of belts, when belts are used instead of gearing; Fig. 9, an end elevation, partially in section, of the belted mills shown in Figs. 7 and 8; Figs. 10 and 11, enlarged detail views of the clutch device applied to the driving-pulley; Figs. 12, 13, and 14, views illustrating details of the feed mechanism.

A represents the frame of the mill or machine, which may be of any usual or approved construction affording the requisite rigidity and strength, and B (J the grinding-rolls, arranged in pairs, one or more pairs being mounted in each frame. The rolls may be of porcelain,chilled iron, steel, or any other material commonly used for the purpose, and one roll of each pair is made adjustable to and from its companion, which latter is preferably carried in fixed boxes or bearings. By referring to Figs. 3 and 4c the manner of mounting the adjustable roll will be readily understood.

D represents an upright swinging arm. mounted upon a pivot, a, the ends I) of which are journaled in frame A, and the arm-sustaining portion of which is set eccentrically with reference to the ends I), so that as the whole 5 is rotated the position of the pivota is changed, raised, lowered, or moved forward or back ward, according to the direction and extent of rotation. One end of the pivot-boltis threaded to screw into the frame and retain the pivot in place, and a jam-nut, G, is employed, as shown in Fig. 4, to prevent the accidental turning of the pivot after it'is properly adjusted.

The long-continued use of the mill is attended with a considerable amount of wear on the parts-the pivots a, as well as others-and in order that there may be no vibration or rattlingat that point,in case of wear or failure to produce an accurate titin the first instance,

Iprovide a threaded stem, (7, which passes upward through the lower end of arm I) and bears against the pivot a, taking up all play thereon. Ajam-nut, e, prevents the unscrewing of stem (7. Two such arms are used for 7 of a lever, F, pivoted to the frame A,or to the 85 hopper-frame, and provided with a sliding or adjustable weight, G, which can be moved along the lever to any desired distance from its pivot h, and thus made to draw roll B to-- ward roll O with whatever force may be neco essary.

The levers F at both sides of the machine are formed with a second short arm or extension, i, beyond the pivot h, and these arms extend beneath and rest against eccentrics or 5 cams j, formed or secured upon a cross shaft or rod, H, one or both ends of which are furniscd with a hand-lever, I, by which the shaft may be turned or rocked. When the rolls are The upper ends of arms D are drawn in working position the cams or eccentrics are too raised up, allowing the weights Gto depress the levers F, and thereby causing the drawrods E to draw upon the arms D,and thus hold them up to working position. When, however, it is desired to spread the rolls apart for any purpose-as, for instance, to prevent injury thereto when running empty-the lever I is moved so as to turn down the cams or eccentrics, which then bear upon and depress the short arms 5, and consequently elevate the weighted ends of leversF,at the same time, of-

course, causing the depending arms g to swing back and relieve the rods E of strain from weight Gr. In order to spread the rolls apart with certainty when thepressure of the. weights Gris removed, each draw-rod E is furnished with a strong spiral spring, J, arranged as shownin Fig. 1; or,instead of this, the spring may be arranged in any common way for the purpose.

The feed-controlling mechanism of the mill is illustrated in Figs. 1 and 2, and certain details thereof are more fully shown in Figs. 12, 13, and 14.

K represents the feed-hopper, provided with a regulating-gate, 70, having a toothed rack, l, on its outer face, in which a pinion, m, carried by a hand piece or lever, n, engages, asshown, so that by raisin}, or lowering the hand-piece the gate will be adjusted as required, a binding or clamping screw, 0, being provided to secure the gate at the desired adjustment. At the bottomof the hopper is placed a grooved or corrugated feed-roll, p, and in front of this, and upon the same horizontal plane, substantially, is arranged a second roll, q, having a smooth surface, and traveling quite close to the surface of roll p, a trough or bottom, 1', being extended from the rear side of the hopper to the front of roll q, beneath the two rolls, to prevent the grain, middlings, or other material from falling before it reaches the chute or secondary hopper L, by which it is conducted to the rolls B (J. The roll 11 is furnished with a shaft, 8, which is carried out beyond the side of the frame-A, and is furnished with a loose band-wheel, M, which is prevented by a collar, t,.fr0m passing off the end of the shaft.

u represents a hub or boss rigidly secured upon shaft 8, and provided with one or more ribs or feathers, 1), which project from its outer face along the shaft 8, and :serve to guide the hub or, boss of an internally-toothed gearwheel, N, which is thus free to slide longitudinally along the shaft, but'cannot rotate except with and as the shaft rotates. This gearwheel has a curved or beveled outer face, and a hub, to, which engages with the hub of wheel M, said hubs being serrated, covered with rubber or leather, or otherwise adapted to lock or bind one upon the other when pressed together with slight force.

w indicates a stiff spiral spring encircling the hub of wheel N, and hearing at one end against the inner face of the wheel, and at the other'end against the hub or boss u of shaft 8,

for the purpose of forcing and holding the I wheel N outward toward wheel M, and to cause and maintain the contact and engagement of the hubs of the two wheels, so that as wheel Misrotated, by belt or otherwise, it is caused to turn wheel N with it, and through said wheel to turn also the shaft 8, thereby imparting motion to the feed-r0111). The device or mechanism may be used in this form, or without a second feed-roll, ifdesired, and with good results. If so used, the hub only of wheelNis required. In practice I prefer, however, to employ the second feed-roll, q, the shaft 3 of which is provided with a pinion, z, to mesh with the teeth of the internally-toothed wheel N, as shown in Fig. 12. By this arrangement both rolls are caused to turn in the same direction, the roll g at a considerably higher speed than roll 1). Roll 1), being corrugated, and located directly under hopper K, serves to draw the material therefrom and'to carryit to roll g, which raises said material in a thin and regular sheet, and carries it over its top and drops it into hopper or chute L,whence it passes to the rolls B C.

It will be seen that under the above construction and arrangementot' parts the spring 00 will hold the hubs of wheels M N normally in engagement, causing the feed-rolls to turn with the rotation of wheel M. When it is desired to stop the feed without stopping the rolls the wheel N is pressed inward away from wheel M, which latter then runs loosely and freely upon the shaft 8, which then remains at rest. Of course if the rolls are stopped the feed necessarily stops, because, as usual, the pulley M is driven by belting from one of the roll-shafts; hence what is required is some means for disconnecting or separating-wheels M and N and. permitting the-former to continue its rotation; but it is -important that when this is done the rolls B C be at the same instant spread apart or separated to avoid injury of their faces.- To secure these several results simultaneouslyand conveniently, I provide the shaft H, which carries the eccentrics j,with an arm, 0, preferably furnished with an anti-friction sleeve or roller, which arm rides against the curved or beveled outer face of gear-wheel N as the hand-lever I is moved inward to raise the weighted levers F and effect the separation of the rolls, forcing saidwheel inward against the pressure of spring :0, and holding the wheel in such position so long as the hand-lever I remains in its said position. The wheel N and feed-rolls consequently cease to rotate and remain at rest until the handlever I is again thrown outward, permitting the weighted levers F to restore the roll B to its working position, the outward movement of said lever also carrying outward the arm 0 and permitting the spring :12 to again cause the engagement of the hubs of wheels M and N, and the consequent starting or recommencement of thefeed.

I would here remark that the details are not essential, though I have shown and described what I deem the most convenient and satis- ICC factory arrangement; but I believe myself to be the first to provide for simultaneously stopping the feed and spreading the rolls, and therefore, while claiming the mechanism here shown and explained, and believing it to be admirably adapted to carry out my invention in this particular, I do not limit myselfto the the specific mechanism shown.

The mill is designed to be driven by gearing or belting, as may be preferred, the arrangement of each being clearly illustrated in the several figures of thedrawings, it being understood that the gearing may be at one or both ends of the rolls.

1 will now refer to Figs. 1, 2, 3,4, 5, and 6 for the purpose of explaining the arrangement of the gearing, which is particularly designed to overcome the present or usual difficulty of providing gear suitable to be used with rolls varying slightly in diameter, as commonly happens with all kinds of rolls, but more esspecially with those made of porcelain.

In order to entirely remove an imperfection or flaw, it is often necessary to turn the roll down smaller than the standard size; or the rolls wear away in use, and then the gearing gives but indifferent results if arranged in the ordinary way. To obviate these difficulties, and to compensate for wear of the pinions, rolls, shafts, &c., I provide the shafts of rolls 13 each with a pinion wholly independent of that of the companion roll; and I furtherprovide a counter-shaft, P, carrying at one end a band wheel or pulley, Q. and at the other end a gear-wheel, R, which gears with and drives pinion T of roll 0, and likewise gives motion to pinion U of roll 13 through the medium of an adjustable intermediate gear or pinion, V.

It will thus be seen that as roll B swings or moves away from roll 0 its gear U moves circumferentially about the gear V, and although the pivotal point of the swinging arms 1) is not concentric with gear V the line of movement corresponds so nearly to the circumference of said gear that the slight movement due to the separation of the rolls does not perceptibly change or affect the mesh of the pinions U V. The pinion V is carried by a journal or axle, W, which is guided up and down in a slot,'X, in the frame A, being raised and lowered by a nut, Y, screwed upon a rod, Z,jointed to the axle or journal W, said nut working between lugs or cars a, cast upon frame A, and through which the rod is carried, as shown in Figs. 1, 3, 4, 5, and 6, the slot X being curved or: the arc of a circle concentric with countershaft P, so that in adjusting the pinion V itis kept always at the same distance from the counter-shaft. This adjustment permits gears of difl'erent sizes to be substituted for gear U.

When two sets of rolls are employed it is advantageous to use driving-belts instead of gearing, though it is apparent that the gearing may be applied to any desired number of sets of rolls in the same mill or machine.

The arrangement of the belts is illustrated tween the pulleys E F.

in Figs. 7 and 8, and requires four belt-wheels at each side or end of the mill.

The counter-shaft P is employed, the same as where gearing is used, and from a pulley, A, at one end of the counter-shaft a belt, D, is carried around pulleys E F on the shafts of rolls B B, and also about a band or belt tightener pulley, G, arranged below and be- At the opposite side or end of the machine the rolls 0 G are furnished with belt-pulleys H I, and the countershaft P is provided with a similar pulley, J, and a cit-tightening pulley, K, is arranged below pulley J, all as shown in Fig. 7. As

also seen in said Fig. 7, the belt L passes from counter-shaft pulley J, between and around pulleys H I, and thence to and around tightener pulley K, while belt 1) passes from counter-shaft pulley A,aroundthe outer sides of pulleys E F, and down between them to tightener-pulley G, by which arrangement the rolls B B are driven in one direction and the rolls 0 (J in the reverse direction.

The tightener-pulleys G and K are each carried by a slide, 0, moving in suitable guides on frame A,andare caused to actwit haconstant elastic pressure by reason of springs M, the compression or force of which isregnlated and controlled by set-screws N.

The band-wheelQ, through which motion is imparted to the counter-shaft P,vis loose upon said counter-shaft, but is made with a beveled flange or rinnf, which is turned to fit snugly within the rim of wheel A when the two are forced together. The wheel A is free to move longitudinally upon shaft 1, but is prevented by a spline or feather, h, (shown in Fig. 10.) from rotating thereon, and its hub is circumfe'rentially grooved to receive a stud or roller, g,projecting from a hand-lever P, by which lever the wheel may be moved along the shaft to cause it to clutch with or disengage from wheel Q. This construction and arrangement will be more readily understood by referring to Fig. 10, where it will also be seen that the hub of the wheel Q is grooved, and encircled by a band or collar, which is connected by links 1 m to the hub or boss n of wheel A to prevent the accidental or undue separation of the wheels. in Fig. 6 the wheel Q is represented as fitting over the wheel A; or. in other words, the arrangement shown in Fig. 12 is simply reversed.

The hand-lever P may be held at any desired adjustment by a locking-dog, 0, engaging in a rack, 19, or by any similar and common locking device.

The employment of a friction -clutch permits the machine to be stopped readily and started gradually without disarranging the belts or varying their tension, and is of great importance in this particular class of machines.

When the toothed gearing is used it is found that the gear-wheels exert a force upon the journals of the rolls, tending to force said rollers together at the geared ends, and to connteract this tendency I provide a yielding or I as part of the subjectmatter of another applielastic pressure-rod, Q, passing through ears or guides on the frame A,.and hearing at one end against the swinging arm D at a point above its pivot. The rod is encircled by a strong spring, 11, one end of which bears against a shoulder or head, t", at or near the outer endof the rod, while the other end bears against the stationary lug or ear j, through which the rod passes, as more plainly shown in Fig. 5.

S is a nut screwed upon the rod in rear of lug j, and which, being screwed backward or forward, controls the distance to which the rod may project, and consequently the distance to which the arm D may move inward before coming in contact with the rod and encounter ing the resistance of the sprin It is found in practice that the material acted upon is liableto cake upon the rolls, and that a single doctor-plate or scraper fails to perfectly clean a roll at all times; henceI provide two, three, or more scrapers for each roll.

When the mill is first started, and before the parts have all acquired a perfect working adjustment relatively to each other, the scrapers will be found to touch some portions of the rolls and to clear other portions, and in order to cause them to quickly wear to tit perfectly the faces of the rolls I provide the levers which carry them with adjustable weights, which are set well out from the pivots until the plates are worn to conform perfectly to the surfaces of the rolls, after which they are set in nearer to the pivots to avoid unnecessary wear of the rolls orplates.

The arms 9 of levers F are provided with two or more notches to permit the rods E to be connected thereto nearer to or farther from the pivots It, and a nut is applied to each end of said rod to permit the proper adjustment of parts to secure the desired position of lever F.

The mill constructed as thus described is- A second tightener-wheel, T, may he employed on the driving side of the mill, if found desirable, to give proper friction of the belt.

A guard is placed over the gearing, as shown in Figs. 2 and 4. 7

Although I have for the purpose of fully disclosing my invention explained its application to varying styles of machines, 1 do not herein claim the construction or arrangementof thetoolhcd gearing, the friction-clutch, or the pressure-rod, which features I reserve cation.

Having thus described my invention, what I claim is- 1. The combination, in a roller-mill, of rolls B (J, swinging arms D, carrying roll B, levers F, formed with arms g, weights G, applied to said levers, and rods E, extending from the arms 9 to the swinging arms D, and connected therewith, whereby the weighted levers are caused to draw the roll 13 toward the roll (J.

2. In combination with rolls B O, movable supports D, carrying roll'B, weighted levers F, having arms 9, rods E, connecting the movable supports D and arms g, and a shaft provided with eccentrics, adapted and arranged to raise the weighted levers, substantially as set forth.

3. In combination with a swinging rollersupport, and with an adjustable pivot therefor, a take-up, substantially such as shown, to compensate for the wear of the pivot or its seat.

4. The combination of swinging arm D, pivot a, and take-up d, all constructed and arranged substantially as shown and described.

5. In a roller-mill, the combination of a roller mounted in stationary bearings, a roller mounted in movable bearings, a feed-regulating device, and mechanism adapted and arranged to simultaneously stop the feed and separate the rolls.

6. In combination with a fixed roll and an adjustable roll, a feed-regulating mechanism, a roll-spreading mechanism, and a lever or hand-piece, common to both the spreading mechanism and the feed-regulating mechanism, whereby the stopping and starting of the feed may be effected simultaneously with the spreading apart or drawing togetherof the grinding-rolls, and by a single operation.

7. In a roller-mill, the combination of feed roll shaft 8, band-pulley M, arranged to turn loosely upon said shaft, sliding wheel N, and cross-shaft H, provided with arm 0, adapted to separate the hubs of band-wheel Maud wheel N, as and for the purpose set forth.

8. In a roller-mill, the combination of feedrolls 1) q, one provided with pinion z and the other with internally-toothed gear-wheel N and loose band-wheel M, the gear-wheel being pressed toward the band-wheel bya spring, a, and prevented from turning on its shaft, and the cross-shaft H, provided with arm 0, as and for the purpose explained.

9. In a roller-mill, the combination of rolls B 0, movable and fixed supports for said rolls, respectively,weighted levers F, connected with said movable supports, substantiallyas shown, shaft 8, band-pulley M, loosely mounted upon said shalt, wheel N, free to slide but held against rotation upon shafts, the feed-roll, and cross-shaft H, provided with hand-lever 1, cccentricsj, and arm 0.

10.. The herein-described roller-mill, consisting of frame A, rolls B B O 0, each provided with a band-pulley, counter-shaft P, provided with a band-pulley at each end, and with a the manner shown and described,and neither driving-wheel, Q, and the tightener-pulleys passing outside of the machine, whereby the G K, allsubstantiallyas shown anddescribed. l mill is rendered complete in itself, and ready :5

5 11. In a roller-mill, the combination of two for operation upon the application of power to sets of rolls, the rolls of each pair arranged to the driving-wheel of the counter-shaft. rotate toward each other a counter-shaft ar- T ranged in the frame of the mill, and provided FRIEDRICH with a band-pulley, whereby it may receive In presence of- 10 motion from a prime motor, and two endless FRIEDRICH SOHABELITZ,

belts passing from pulleys 0n the counter-shaft ROBERT STOLZ.

to and around pulleys on the roller-axles in 

